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George W. Bush has knee replacement surgery in Chicago

(CNN) -Former President George W. Bush is back at home in Dallas, following partial knee replacement surgery Saturday in Chicago.

Bush spokesman Freddy Ford told CNN that the former president “had a successful partial knee replacement Saturday and came back to Dallas Monday.”

Ford adds that it was not a new injury and that Bush was “up walking around and even went up and down a flight of stairs just a couple hours after the procedure.”

Bush, 67, remains active and regularly rides his bike. Earlier this month he led a physically demanding bike ride at his ranch near Crawford, Texas, to honor military members wounded in the wars in Iraq and Afghanistan. Last August, the former president had a stent placed in his heart after a blockage was discovered in an artery.